冲击载荷作用下准脆性材料II型裂纹扩展研究

›› 2011, Vol. 32 ›› Issue (10): 3155-3162.

冲击载荷作用下准脆性材料II型裂纹扩展研究

袁琳¹，徐涛^{1, 2}，赵高峰³，杨岳峰⁴，陈庚¹

1.大连大学材料破坏力学数值试验研究中心，辽宁大连 116622；2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，成都 610059； 3.新南威尔士大学土木环境工程学院，悉尼澳大利亚 NSW 2052；4.大连理工大学岩石破裂与失稳研究中心，辽宁大连 116024

收稿日期:2010-05-08 出版日期:2011-10-10 发布日期:2011-10-13
通讯作者: 徐涛，男，1975年生，博士，副教授，主要从事岩石类材料破裂与失稳方面的研究。E-mail: neuxutao@126.com E-mail:tanzon_04@126.com
作者简介:袁琳，女，1986年生，硕士，主要从事岩石类脆性材料破裂与失稳方面的研究
基金资助:
国家自然科学基金项目资助（No. 41172265, No. 50874020）；地质灾害防治与环境保护国家重点实验室基金资助（No. SKLGP2010K008）；教育部留学回国人员科研基金资助(2011年)

Study of mode II crack propagation of quasi-brittle material under impact loading

YUAN Lin¹, XU Tao^{1, 2}, ZHAO Gao-feng³, YANG Yue-feng⁴, CHEN Geng¹

1. Research Center for Numerical Tests on Material Failure, Dalian University, Dalian, Liaoning 116622, China; 2. State Key Laboratory of Geo-hazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 3. School of Civil and Environmental Engineering, the University of New South Wales, Sydney NSW 2052, Australia; 4. Center for Rock Instability and Seismicity Research, Dalian University of Technology, Dalian, Liaoning 116024, China

Received:2010-05-08 Online:2011-10-10 Published:2011-10-13

摘要/Abstract

摘要： 冲击载荷作用下准脆性材料的动态断裂一直是关注的热点问题，Ⅱ型裂纹试样受冲击剪切时其裂纹扩展方向同材料力学性质和冲击速度等密切相关。应用岩石动态破裂过程动态分析系统软件，对单边平行双裂缝试样开展了冲击载荷作用下的裂纹动态扩展数值模拟，分别研究了不同材料力学性质、材料均质度、入射应力脉冲幅值和历时对II型裂纹动态扩展的影响。数值模拟结果表明，纯II型裂纹在动荷载作用下的扩展，不仅受到剪切损伤，而且还存在拉伸损伤；准脆性材料的非均匀性导致了主裂缝周围产生大量微裂纹的破坏，影响裂缝的分岔和内部的应力值；应力幅值和应力脉冲历时分别超过某一定值时，主裂缝将出现分叉现象，试样的破坏程度加剧，其研究结果对于深入揭示准脆性材料在动荷载作用下II型裂纹扩展的规律及准脆性材料的损伤断裂机制具有重要的参考价值。

关键词: II型裂纹扩展, 应力波, 非均匀性, 准脆性材料, 冲击载荷

Abstract: Dynamic failure of quasi-brittle materials under dynamic loading has been a hot issue; the direction of crack propagation of pre-cracked specimens with mode II crack subjected to impact shear loading is closely related to its mechanical properties and impact velocity. The numerical simulations of dynamic shear crack propagation in specimens with two parallel edge pre-notches subjected to impact loading were carried out to investigate the propagation of mode II crack using rock failure process analysis-dynamic code. The effects of material properties, material heterogeneity, incident stress pulse amplitude and duration on the mode II crack propagation path were also investigated. The numerical results show that the mode II crack propagation under impact loading is induced by the shear damage as well as the tensile damage. Microcracks around main-crack are due to the material heterogeneity, which in turn influences the crack bifurcation and associated stress fields around cracks. Crack branching occurs and the specimen is further damaged when stress amplitude and duration are respectively beyond a certain value. The study result is of great help to investigate the law of mode II crack propagation and reveals the mechanism of damage and fracture of quasi-brittle materials under impact loading.

Key words: mode II crack propagation, stress wave, heterogeneity, quasi-brittle material, impact loading

中图分类号:

TU 452

袁琳徐涛赵高峰杨岳峰陈庚. 冲击载荷作用下准脆性材料II型裂纹扩展研究[J]. , 2011, 32(10): 3155-3162.

YUAN Lin XU Tao ZHAO Gao-feng YANG Yue-feng CHEN Geng. Study of mode II crack propagation of quasi-brittle material under impact loading[J]. , 2011, 32(10): 3155-3162.

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